trying to become a recognized singer.

Body swap with same or opposite genders

same gender

contract relationship or contract cohabitation

FL 


Antagonist ML or FL

lead characters must marry each other because their noble families demand it(this one usually ends in a happy ending lol)


FL and ML are rivals from childhood or childhood friends

Rivals


ML fight for FL or FL fight for ML

ML  

when riding a horse, ML sits in front or behind of FL? 

Realistic rate


White truck of doom or Terminal illness 

White truck of doom. Also known as Truck-kun in anime. 

ML wears white or black suit for wedding